diff --git a/smnp.system.md b/smnp.system.md
index ad1c26e..0a0dffb 100644
--- a/smnp.system.md
+++ b/smnp.system.md
@@ -1,3 +1,6 @@
 # Functions
 ## `exit(exitCode: int = 0)`
-## `sleep(milli: int)`
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+Immediately interrupts the script and returns given exit code to the system.
+
+## `sleep(milli: int)`
+Suspends the script execution for a given time in milliseconds.
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